Same block logic as pants
Shorts are essentially a shortened pants block. Waist, hip, rise, crotch curve, side seam, and inseam still need to balance correctly.
Sewing pattern guide
Shorts measurements guide
Shorts use the same construction logic as pants, but the short inseam makes the crotch curve, thigh width, and hem allowance more visually important.
Shorts look like the easy version of pants, but the short inseam changes what matters. On full-length trousers, a slightly generous thigh or an imperfect crotch curve disappears into the length of the leg; on shorts, the hem sits right at the thigh, so the relationship between thigh circumference and hem opening decides whether the shorts hang cleanly or ride up with every step. The measurements themselves take ten minutes — this guide focuses on taking them precisely and on the two decisions unique to shorts: the inseam length and the hem width.
The generator drafts the shorts block from your waist, hips, rise (crotch depth), outseam, inseam, thigh, and hem circumference. The upper block — waist, hips, and crotch — follows the same logic as pants, so if you have already measured for the pants generator, you can reuse those values and only add the thigh and the shorts-specific lengths.
You will need a flexible tape measure, narrow elastic to mark the natural waist, a hard flat chair for the crotch depth, and a pair of shorts whose length you like — the fastest way to choose an inseam is to measure one you already trust. Work in underwear or a thin layer and enter everything in centimetres.
Use this guide
Related pattern templates
Open a matching generator after reviewing the guide, then preview the calculated draft before export.
Generator
Basic shorts pattern
Generate a shortened pants-based block with thigh opening and hem checks.
GeneratorBasic pants pattern
Create front, back, waistband, crotch, inseam, outseam, and hem guides.
GuideSeam and hem allowances
Review solid lines, dashed cutting lines, seam allowance, and larger hem allowance.
Short inseam length
A small inseam makes curve transitions more noticeable. The inner leg should flow smoothly from hem toward the crotch curve without a sharp accidental break.
Thigh and hem opening
Thigh width controls comfort when sitting and walking. Hem width controls how close or loose the shorts feel around the leg.
Front and back rise
The front rise is usually shorter than the back rise. The back needs more length and shaping to cover the seat.
Optional darts
Shorts can be drafted without darts, with a back dart only, or with front and back darts depending on the waist-to-hip difference and desired fit.
Hem allowance
Shorts often benefit from a larger hem allowance than construction seams, especially when the lower edge will be turned up or topstitched.
Before cutting fabric
After generating shorts, check that the inseam is smooth, front and back side seams match, the waistband length follows the effective waist, and the hem allowance is large enough for the finish you plan to sew.
Step by step
How to take each shorts measurement
Follow this order: the elastic from step one is the reference for the waist, crotch depth, and outseam. Stand relaxed, weight even on both feet, and take each circumference with the tape snug but never denting the skin.
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01
Mark the natural waist and measure it
Tie narrow elastic around your middle and bend side to side; it settles at the natural waist, the narrowest point just above the navel. Measure the waist exactly along the elastic, parallel to the floor, with room to slide one finger under the tape. Even for casual mid-rise shorts, measure here — the draft references the natural waist and lowers the line in a controlled way.
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02
Measure the hips at the widest point
Run the tape over the fullest part of the seat, usually 18–23 cm below the natural waist, keeping it level all the way around — check in a mirror that it does not dip at the back. Take the largest value you find. On shorts the seat area is a large share of the whole garment, so a 2 cm hip error is far more visible than on trousers.
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03
Measure crotch depth sitting on a hard chair
Sit upright on a flat, hard chair and measure with a ruler held vertically at your side, from the elastic at the side waist straight down to the chair surface. This is the crotch depth (rise). Sit tall — slouching or a soft seat shortens the value and drafts a crotch that pulls. On shorts an incorrect crotch depth is even more noticeable than on pants, because there is no long leg below to visually absorb it.
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04
Measure the thigh at its fullest point
Standing with weight on both feet, wrap the tape around one thigh at its thickest point — usually 3–6 cm below the crotch. Keep the tape horizontal and snug without compressing the muscle, and do not tense the leg. This value governs walking and sitting comfort and, together with the hem width, controls whether the shorts ride up.
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05
Choose the inseam from shorts you like
Lay a well-loved pair of shorts flat and measure the inner leg seam from the crotch intersection to the hem edge — that is your inseam. If you have no reference pair, stand in front of a mirror and mark the height where you want the hem on your leg, then measure from your crotch level down to the mark. Common values run from 5 cm for brief summer shorts to 20 cm or more for knee-length styles.
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06
Measure the outseam to the same hem level
Along the side of the body, measure from the elastic at the natural waist down to the intended hem level. Cross-check: outseam should approximately equal crotch depth plus inseam. If the numbers disagree by more than 2 cm, one of the three is off — resolve it before generating rather than after printing.
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07
Decide the hem circumference
The hem opening is a design value, not a body measurement, but it has a hard lower limit: it must clear your thigh with room to spare. Measure the leg opening of reference shorts you find comfortable, or start from your thigh circumference plus at least 5–6 cm for woven fabric. Wider hems read relaxed and stay put; hems close to the thigh value look sleek on the hanger and creep upward in wear.
Inseam length and the resulting look
Unlike circumferences, the inseam is a style decision. This table shows where common inseam values end on a leg of average proportions and what they imply for the draft. Heights vary — always confirm against a reference pair or a mirror mark rather than picking a number blind.
| Inseam (cm) | Hem ends roughly at | Resulting look and notes |
|---|---|---|
| 5 | Upper thigh | Brief summer shorts; hem must clear the fullest thigh point, wide opening essential |
| 8 | Upper third of thigh | Casual short shorts; still above the widest thigh on most bodies |
| 10 | Mid-thigh | Classic casual length; hem sits near the fullest thigh — watch the hem-to-thigh margin |
| 13 | Just above mid-thigh gap | Chino-style length; balanced for most silhouettes |
| 15 | Lower thigh | Tailored city shorts; taper only slightly to avoid ride-up |
| 20+ | Just above the knee | Bermuda length; behaves closest to cropped trousers in fit |
Between about 8 and 13 cm the hem passes directly over the fullest part of the thigh — this zone needs the most generous hem opening. Longer or shorter hems sit on narrower parts of the leg and are more forgiving.
Common measuring mistakes
Taking crotch depth standing up
The crotch depth must be measured sitting on a hard chair, from the side waist vertically to the seat surface. Taken standing, or measured as a front-to-back wrap through the legs, the value describes a different thing entirely and the crotch line of the draft lands wrong.
Measuring the thigh in the wrong spot or tensed
Measuring mid-thigh instead of the fullest point just below the crotch understates the value by 2–5 cm, and tensing the muscle changes it again. Relax the leg, find the thickest point, keep the tape level, and take the reading twice.
Copying an inseam from a ready-to-wear size label
Two brands' 10 cm inseams can end at visibly different heights because rise and cut differ. Measure the actual inner seam of shorts you own and like, laid flat — that number transfers to the generator directly.
Choosing a hem opening equal to the thigh
A hem that merely matches the thigh circumference has zero clearance: every step compresses fabric against the leg and ratchets the hem upward. Keep at least 5–6 cm of difference in woven fabric, more for longer inseams that end near the widest thigh point.
Measuring hips or thigh over bulky clothing
Shorts fit closely through exactly the zones where pockets, seams, and thick fabric distort the tape. Measure the waist, hips, and thigh in underwear or a single thin layer, never over another pair of shorts.
Skipping the outseam cross-check
Because shorts measurements are few, one bad value dominates the draft. Always verify that outseam ≈ crotch depth + inseam before generating; a mismatch of more than 2 cm means re-measuring, not averaging.
From measurements to shorts that behave
Hem width versus thigh: the ride-up equation
Shorts ride up when the hem opening cannot slide back down over the thigh after each stride. The fix is geometric, not fabric softener: give the hem at least 5–6 cm over the thigh circumference in wovens, and more when the inseam puts the hem at the fullest thigh point. If a previous pair crept upward, widen the hem or shorten the inseam so the hem sits on a narrower part of the leg.
Crotch depth comfort at short lengths
A crotch drafted too low shows immediately on shorts as a saggy pouch between the legs; too high, and the inseam cuts in when sitting. If your muslin shows either, correct the entered crotch depth by 1–1.5 cm at a time and regenerate — small steps, because the short inseam amplifies every change.
Ease for woven versus stretch fabric
For woven shorts, 2–4 cm of hip ease gives a neat fitted result and 4–8 cm a relaxed one; culotte-style presets add considerably more through the leg. With stretch wovens (2–3% elastane) you can trim hip ease toward 1–2 cm, but keep the thigh and hem clearances — elastane recovers circumference, it does not stop ride-up caused by a tight hem.
Test the muslin in motion
Print at 100%, confirm the 5 × 5 cm test square, and sew a quick muslin. Then do what you actually do in shorts: walk briskly, sit on a low chair, climb stairs. Watch the hem — if it creeps and stays up, enlarge the hem opening; if the back waist drops when you sit, the back rise needs length. Ten minutes of movement testing tells you more than any standing mirror check.
Frequently asked questions
Can I reuse my pants measurements for shorts?
Yes. Waist, hips, crotch depth, and the outseam logic are identical — only the lengths change and the knee value is replaced by the thigh circumference. Take the thigh at its fullest point and choose the inseam as described above, and the rest transfers directly.
Why do my shorts ride up when I walk, and how do I prevent it in the draft?
Almost always because the hem opening is too close to the thigh circumference at the height where the hem sits. Enter a hem at least 5–6 cm larger than your fullest thigh for woven fabric, or shorten the inseam so the hem lands above the widest point. Fabric choice matters far less than this clearance.
How do I pick an inseam length without trying anything on?
Measure the inner seam of shorts you already like, laid flat from the crotch intersection to the hem. Failing that, mark the desired hem height on your leg in a mirror and measure down from crotch level. The reference table above shows where common values end and which ones need extra hem width.
Do I add seam and hem allowances to my measurements?
No — enter body measurements only. The generator adds your chosen seam and hem allowances separately and draws them as the dashed cutting line around each piece. Shorts hems are often finished with a turned-up cuff, so consider selecting a deeper hem allowance for that finish.
How do I make sure the printed pattern is the right size?
Print the PDF at 100% with page scaling disabled and measure the 5 × 5 cm test square on the first sheet before assembling anything. This check applies to the A4 tiled PDF, the copyshop PDF, and a plotted SVG alike — if the square is off, fix the print settings, not the pattern.